That feature does not exist - or rather it always exists, and does not need
to be switched on. A column is always[1] as wide as the widest cell in the
column, and a table cell is always at least as wide as required to contain
the content placed in it.
[1]This can be over-ruled using CSS and the table-layout:fixed attribute
for the table element
table {table-layout:fixed; width:400px;}
when the columns will take on the width of the cells as defined in the
first row of the table, regardless of content.